Good light, based off of the classic P series, so it uses the P90 and P91 lamps. Personally, I like the newly introduced and redisgned 9P, because it has a round body, and no clip.
I have a D3 but I think it is too big to have a pocket clip. I would also go with a 9P. It is a great light with great output but not a lot of throw however you can add a Turbo Head if you need more throw.